Internal combustion engine



FIG. 1 is a front perspective view of an internal combustion engineshowing my new design;

FIG. 2 is a left front perspective view thereof;

FIG. 3 is a right front perspective view thereof;

FIG. 4 is a right side perspective view thereof, it being understoodthat the left side is a mirror image of the right side shown herein; and

FIG. 5 is a right rear perspective view thereof.

The broken lines in the drawing are for illustrative purposes only.

The ornamental design for an internal combustion engine, as shown anddescribed.